Skiving-machine.



PATENTED l iov. 5 19071 G. w. P AIRBANK.

SKIVING MACHINE.

APPLICATION FILED AUG. 20, 1904.

'2 SHEETSTBHEEI 1 PATENTED NOV. 5, 1907.

-G. W. FAIRBANK. SKIVING MACHINE.

APPLIOATION FILED 11118.20, 1904.

2 SHEETS+SHEET 2.

I the knife edge.

' itshould receive a beveled UNITED STATES PATENT OFFICE.

GEORGE W. FAIRBANK, OF WAYLAND, MASSACHUSETTS.

SKIVING-MACHINE Specification of Letters Patent.

' Patented Nov. 5, 1901:.-

Application filed August 20,1904. Serial to. 221.471.

cation, reference being had to the accompanying draw- My'inventionrelates to mechanism for skiving or beveling strips of leather at theedges thereof in order that the leather may be folded or sewed to otherpieces at this point. My invention has particular reference, however, tothat type of skiving machine known as the Amazeen, comprises or. has ahorizontal rotary disk knife co-acting with the face of a feed roll,adapted to support the leather during the cutting, and to feed the sameagainst The position of the leather is defined by means of a gage, andthe leather is held against the roll and guide to the knife by means ofa presser arm I projecting across the face of the roll just in front ofthe knife edge and by means also of a disk which partially crosses theface of the roll and has a rotary movement,

assisting the roll in the feeding of the leather to the knife and alsoserving to keep the leather pressed against the gage whereby thealinement of the leather strip is maintained during the cuttingoperation. The face of the roll is ordinarily offset or of two diametersseparated by an abrupt shoulder, the rotary disk cooperating with thesmaller diameterahd the presser, arm extending over both, whereby thestrip is bent sharply at the shoulder of the roll and only the edge orportion thereof lying on the larger diameter thereof may receive thecutting contact of the knife to be cut'thereby. The position that theedge of the leather assumes with regard to the knifeby virtue of thisold structure of the roll is such that the strip receives a' deepconcave cut, or in other words, becomes gouged out when or inclined cut.Practical usage has demonstrated that an edge out in the way firstmentioned is very objectionable for certain kinds of work, the edgebeing extremely liable to be broken or torn away.

It is accordingly one object of my invention to modify the-feedingmechanism of the skiving machine in a way to insure such a presentationof the leath or to the cutting edge that upon being cut the flange ofthe strip has a straight beveled edge, or in other words, is

of along taper in cross section, whereby its increasing of its beingtorn'or' strengthprecludes the possibility broken in ordinary usage'. Iaccomplish this object by'eliminating the abrupt boulder, on the face ofthe roll :and substitute therefor a. curved surface presenting aroundingedge.

Inorder to properly feed and guide theleather strip to the knife thegage'and pfesser arm, especially at'rthe or machine of similarcharacter, which point of the gage, should be as close to the knife edgeas possible for if the knife is separated too far from the presser andgage, then by reason of the space left the knife may tend to buckle theleather and consequently injure it. This space is often left when thegage is adjusted.

It is accordingly another object of my invention to improve the skivingmachine by preventing'the buckling or crumpling of the leather at anypoint between the presser arm and gage and the knife edge. This object-I accomplish by providing a curved presser arm which is fixed to thegage so that both may be adjustable together and then providing means bywhich the gage and curved presser arm may be adjusted around therounding surface of the knife.

It has already been stated that the feeding and support of the leatherduring the cutting is by means of a rotary feed roll to the face ofwhich the disk knife is substantially tangential. This roll, of course,does not provide a flat bearing surface for the strip, but recedesrapidly from the -under face of the cutting knife, only supporting thestrip against the same at the cutting edge. This construction permits ofthe leather being seized directly behind the knife for the purpose ofadjusting the position of the leather strip in the machine or fordrawingthe leather taut beyond the cutting edge. The knife beingcircular, however, renders the operator extremely liable to serious cutsin such manipulation of thestrip unless he observes great care.

It is accordingly 2: still further object of my invention to improve theskiving machine by providing means whereby the operator may adjust theleather or draw it from the feeding mechanism without liability {0personal injury from the cutter. This feature of the invention consistsof a flat guard plate mounted on the machine in the manner hereinafterfully explained.

Figure 1 is a side elevation of the mechanism involving my invention.Fig.2 is a top plan of the mechanism shown in Fig. 1. Fig. 3 is acrosssection on the line 33 of Fig. 2. Fig. 4 is a 'crbss section on the line4-4 of Fig. 1.

Referringto the various figures, the standard 1 of the machine is shownas provided with journals 2, 3 and 4, in which are rotatably mountedshafts 5; 6 and 7, ,respectively. The shaft 5 carries the skiving knife8; the shaft 6 the roll 9 for supporting the leather and feeding itagainst the knife 8; while the shaft 7 carries the disk 10 for holdingthe leather against the roll Qfand assisting in feeding'it properly tothe knife, Mounted on the-portion ll of the standard in the mannerhereinafter explained is the gage arm l8 -supporting the gage 13 whichco=acts with the roll 9 and disk 10 to guide and maintain thedeatherstrip in proper alinement.

,flo .providefor an adjustment or variation of the angular position ofthe knife, the journals 2 are pivot ally mounted on the standard as at 14. The elevation of the knife may be varied by means of the screw (Fig.4) engaging the lug 16. This lug is provided with arms 161 to slide inways on the journal blocks 2 and is engaged by collars 17 fast on theshaft 5. The shaft 7 is' yieldingly mounted to have a vertical as wellas a rotating movement in journals 4, but .is pressed down against theface of the leather by a spring, not shown. I

I The gage arm 18 terminates, as may be noted, in a hat plate 19which'connccts with the portion 11 of the standard. Mounted upon thegage arm 18 and plate 19 is a flat spring 22 carrying beyond the gagethe presser arm 2l. The spring 22 is secured to the plate 19 by a screw23. The spring 22 besides being attached to the plate at 23 is providedwith an adjusting screw 24 which I engages the gage arm 18. The tendencyof the spring 7 ing a vertical adjustment of the presser arm it togetherwith its supporting spring is fixed to the gage arm and connecting plateso that the position of the gage and presser arm may be obtained by thesame adjustment.

-' It is alsoto be noted that the presser arnrZl extending i be heldfixed in such position.

of slots 25 and 25 and a locking. screw 26.

beyond the gage l3 is made to describe a curve around the edge of the,knifedn order that it may lie snugly against the edge of the same andleave no space in which the leathermay buckle between the parts. Inorder j that the proper position of the presser arm and gage withrespect to the knife may be maintained whatever the adjusted position ofthe gage may be, provision is made by which they may be angularly andlongitudinally adjusted together. Such provision consists The slot 25 itis to be noted is made in the plate 19 and the slot 25 is made in theportion 11 of the standard. The slots are angularly arranged in suchmanner that by proper manipulation the gage and presser arm may be madeto followthe cu vg of the knife edge and occupy a position snuglyadjacent to the samewithout sufficient intervening space to givetheleather a chance to buckle whatever the position of the gage may be.Then'by means of the locking screw 26 the parts may Fixedly mounted inthe lug 16 is the arm 27 carrying abearing block or journal 28. Mountedto turn and reciprocate in the block 28 is the shaft 29 carrying a guardplate 30. Fast to the shaft 29 are the collars 31 and 32, and betweenthe collar 31 and theblock 28 is the coil spring 33, tending to normallyforce the shaft upward and the collar 32 into contact with the block 28The tension of the spring 33 may-be regulated by adjusting the positionof the collar 3'1'by means of the sotscrew 38. The block 28 is groovedas at 34 (Fig. 1), and the collar 32 is provided with a lock pin 35adapted to register with the groove 34 to normally prevent the collar 32and shaft from turning. Upon pressing the shaft downward, however,against the'spring 33 until the lock pin 35 is clear of the groove 34'the shaft and guard 30 may be swung into the position shown in thedotted lines (Fig. 2), whereupon the knife 8 may be removed orsharpened. It'will be noted that the guard 30 extends slightly beyondthe edge of the knife, as

scopes shown at 36' (Fig. 2), and that it lies just below and very closeto the lower face of the knife, and that its inside edge is beveled at36. The relative elevation of the guard and knife may be adjusted byadjusting the position of the collar 32 on the shaft 29. This is easilyaccomplished by'virtue of the set screw 37. Since the arm 27 carryingthe guard plate is attached to the lug 16, the relative position of theguard and the knife is not affected by the mere angular or longitudinaladjustment of the latter as heretofore described. Of course thisparticular mounting of the guard is not essential, and in otherinstances an adjustment of the guard to corrcspqlil with the adjustmentof the knife may be necessary. I I

The roll 9 is shown as having two faces, 40 and 41,

the one an offset continued into the other by a curved incline 42; Thefirst of these faces, or offset 40, is

adapted to pass under the knife edge, and the relative position of theknife edgewith regard thereto is adjusted to accord to the thickness ofthe leather to be cut, and to the scarf or bevel it isdesired to givethe same. The gage 13 sets closely ove this section of the roll, itsouter or guiding face being shown as just about at the edge 43 of theincline 42, thereby delimiting the inmost posi-' tion of the edge of theleather over the roll. The or.

tion of the gage 13 on the face 40 may, however, be adjusted as by themeans heretofore described; The

yieldingly mounted disk feed-10, overlies the face 41' of the roll andpresses the leather against the same. The presser arm 21 extends beyondthe gage 13, serving to hold the leather down and, by extending over thedisk 10, prevents the latter from being forced by the leather intocontact with the knife.

The strip of leather being placed under the disk 10, and its corneragainst the gage 13, the rotation'of the roll carries it toward theknife, while the gage 13 causes its inside edge to remain in the planeof the edge 43 0f the incline 42. i The leather being forced between theroll face 40 and incline 42, on the one hand, and

the. disk .10 and presser arm 21 on the other, takes the position andshape shown in Fig. 3. This causes its edge to be presented at such anangle to the knife edge that upon contact withthe latter the outtakesthe form of a long bevel. The strip continuing under the knife, passes'under the guard plate 30, the beveled edge 36 thereof causing theleather toturn downward on any contact therewith, and, continuingfurther,

may be seized by the operator to be drawn out.

Whereas l have disclosed a specific embodiment of my invention, it isapparent that certain modifications may beinade therein withoutdeparting from the spirit of the invention, 2 g I What claimas myinvention is:

v 1. In a shyingmachine, a rotatable disk knife, a shaft by which saidknife'is carried, said shaft being mounted to have angular andlongitudinar adjustme'nh'aseml-cimul-ar guard plate entirely below andextending slightly beyond the. rear edge of'the knife, and mounted tomaintain its,

position relative to the knife upon adjustment of the latter.

2 In a skiving machine, a leather supporting and feeding roll comprisinga cylindrical surface, aconica-l surface havinga curved continuationjoining'with sald cylindrical surface as described.

3. In a skiving machine, a rotatable disk knife, a' leathor' Isupporting and feeding roll co-acting with the said knifeto feedthe-leather thereto comprising a, cylindrlcal feeding .sui-tace,'a nd aconical surface, said cyllndric al and conical continuation of theconical surface as described.

4. In a skivina machine, a rotatable disk knife, a guard located beneathsaid knife, said guard being pivotally mounted upon its support topermit of its being swung from under the knife. 2

5.-In a skiving machine, a rotatable disk knife, a guard located beneathsaid knife, said guard being pivotally mounted upon its supp rt topermit of its being swung from under the knife, an venting movement ofsaid guard on its pivot.

' 6. In a skiving machine, a rotatable disk knife, a guard locatedbeneath said knife, 'said guard being pivotaily mounted upon its supportto permit of its being swung from under the knife,,means for maintainingsaid guard normally locked against movement on. its pivot, and means forreleasing said lock.-

located beneath said knife, a pivotal rod or shaft on which said guardls.mounted to be swung from under the knife, said rod having a.longitudinal movement in its bearings and having fas thereon a collar, astationary collar oilug with which he collar on the shaft is'adapted toengage to prevent i'0tation of the shaft, and a spring to normally holdsaid'collars in engagement, substantially asdescribed I S. In a skivingmachine, in combination with a frame or standard, a rotary knife, agag'eand its support, a presser arm connecting therewith, the same beingcurved to conform to the periphery of the knife, said gage supporthaving an adjusting slot whereby it may beadjuste'd longitudinally,

V the said standard having a slot at substantially right angles to theslot in said gage when. aid gage is in place.

a spring lock for normally pre-.

1. In a skiving machine, a rotatable disk knife, a guard 1 surfacesbeing joined by a curved surface consisting of a t and an adjustingscrew adapted to pass through both slots, l

: beveled at its forward end to deflect the material upon 9. In askivlng machine, a rotatable disk-knife, a shaft by which said knife iscarried, said shaft being mounted to have angular and longitudinalmovement, a semi-circular guard plate or disk just beneath and extendingslightly beyond the rear edge of the knife, and mounted to maintain "itsposition relative to the knife upon adjustment of the latter, and meanswhereby the guard may be adjusted upon the machine to permit free accessto. the knife edge.

10. In a skiving machine, a rotatable disk knife, a semi circ lar guardlocated beneath said knife, said guard extending beyond the rear edge ofsaid knife and being contact therewith.

11. In a skiving maclyine, a rotary knife, a'presser arm curved toconform to the periphery of the knife, a gage, and means whereby saidgage and curved presser arm may together in proper coordination ofposition be moved around the edge of said knife and said presser armmaintain a proper ,position'snugly adjacent thereto through the extentof its said curvature.

12. In a skiving machine, a rotatable disk knife and a feed rollcoacting with the edge thereof, said roll having faces of two diametersand between the same said roll presenting an outwardly rounding surface,and means for causing the leather to conform to the outline of saidsurface, substantially as and for the purposes set forth.

GEORGE \V. FAIRBANK.

In presence of )I. V. Funny, M. E. FLAuuu'rY,

